Gate-valve.



No; 726,434. PATENTED APR. 2a, 1903.

0. B. KAISER.

GATE VALVE.

APPLICATION rum) DBO. 11, 1902.

no MODEL.

: UrTTTEio STnTEs OLIVER. l3. KAISER, OF NORVVOOD,

OHIO, ASSIGNOR TO THE STACEY MANUFACTURING COMPANY, OF CINCINNATI, OHIO, A CORPORA- TION OF OHIO.

GATlE -VALVE.

SPECIFICATION forming part of Letters Patent No. 726,434, dated April 28, 1903.

Application filOdDeGBlllbGl 11, 1902. Serial N0;134=,7'73. (No model.)

To all whom it may concern:

Be it known that I, OLIVER B. KAISER, a citizen of the United States, residing at Norwood, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Grate-Valves, of which the following is a specification.

My invention relates to an improvement in valves of the double-gate type and principally designed for use with gas.

One of the objects of my invention is to provide a valve in which the gates in the act of closing are simultaneously expanded against their seats by means of a wedging pressure exerted upon the centers of the gates,thereby making an efiectual and uniform circumferential contact with their seats. This construction as well produces a perfect seal, and, further, the parts are so arranged and constructed as to collapse inward when released, affording a free and easy manipulation of the valve.

Another object of my invention is to provide means whereby access may be had to the interior of the shell or body proper with the valve-gates securely locked, affording a large opening and convenient facilities for cleaning the shell of the sediment deposited therein, such as tar, (he. I

The features of my invention are more fully set forth in the description of the accompanying drawings, forming a part of this specification, in which-- Figure 1 is a side elevation, partly in section, of my improved valve. Fig. 2 is a section on line :0 00, Fig. 1. Fig. 3 isa sectional perspective View of the shell, showing the enlarging opening. Fig. 4 is a perspective view of the gate-carrier frame. Fig. 5 is a perspective view of one of the gate-supporting gibs.

In valves of this class used for gas purposes it is quite essential that the same be so constructed and arranged as to substantially protect the parts from accumulations of tar and the like within the shell, which sediment being very sticky prevents the free manipulation of the valve. It is also desirable to provide an enlarged opening into the shell in order to enable the thorough cleansing of the valve parts,which cleansing is generally done by injecting steam or by applying heat by means of a torch. Therefore it is essential that the valve be securely sealed during the cleansing operation.

A represents the valve ease or shell, having a valve-opening at extending upwardly,'said opening being bounded by a suitable flange a, upon which is secured a hollow cap B, said opening and cap being of sufficient area to contain the valve mechanism when the valve is in its open position. A recess 1) is formed at the top of the cap B for receiving the collar 0 of the valve-stem C.

1) represents a stuffing-box, and b the gland therefor, said parts being suitably secured to the capby means of bolts. These parts are of the ordinary construction.

D represents a gate-carrier, which is screwthreaded at its upper portion, engaging with the screw-threaded portion of the valve-stem O for raising and lowering the valve mechanism, and at the lower portion with a crossbar d, having a central orifice d F represents gibs fitting into the opening 01 of the carrier-frame D, one being provided for each gate.

E represents the valve-gates, adapted to engage the internal annular valve-seats a the faces of which are ground in the usual manner.

6 represents circular bosses projected toward each other from the center of the gates andadapted to engage the recesses formed in the gibs F and supported thereby.

The carrier-frame is constructed at its upperportion with the V-shaped boss 01 the.

faces of which are slightly curved, terminatstablish a uniform central wedging pressure upon the gates E.

it represents vertical guideways for the gates E to insure free movement, preventing the ground faces of the gates from being injured.

K represents a plate for closing the opening K at the base of the shell and secured in position by set-screws. This plate also acts as a rest for the wedge G as the valve is being closed.

t' represents lugs for supporting the valvegates'when the plate K is removed, thereby permitting the gates to be locked in their closed position by the further downward movement of the carrier-frame D, in which instance the wedge d alone is relied upon.

Mode of operation: Assuming the valve mechanism to be in the open position, which would occupy the space between the cap and the valve-opening e, in order to close the same the stem (3 is revolved by the handwheel J, feeding the carrier-wheel with its contained parts downward until the wedge G rests upon theplate K, when a continued revolution of the stem will bring the wedges G and d toward each other, expanding the gibs F outwardly and locking the gates to their seats. By this construction a uniform central pressure is brought upon the gates,

resulting in a uniform circumferential contact of the gates against their seats. In the opening of the valve a slight release of the wedging pressure causes the gibs to collapse inwardly. The wedge G is released from contact with the gibs and is supported by the cross-bar 61. As the hand-wheel J is unscrewed the carrier D, with the gibs F, gates E, and wedge G, are all lifted. When it is desired to clean the valve-shell, the valve is closed, the parts occupying the position shown in Fig. 2, the plate K is removed, immediately releasing the wedge G, which may have a tendency to slightly loosen the lock of the valve-gates, but with a slight feeding of the carrier-frames downward, the gates resting on the lugs 'i, enabling the same to be securely locked by the wedging pressure of the wedge D. By this construction an enlarged openingis obtained, enabling easy access to the shell, and also around the valve parts, for the insertion of a steam hose or torch for removing the sediment deposited. Also the valve is securely locked, preventing the escape of gas during the cleaning operation. The lugs i are tapered at their upper or gate-contacting end in order to prevent the lodgment of any sediment there which might interfere with the operation of effectually sealing the gates.

Having described my invention, I claim 1. In a gate-valve, the combination with a carrier-frame having a wedge integral there with at its upper portion, gibs loosely supported by said frame, having their inner faces inclined, a second wedge loosely supported at the lower portion of the carrier,said Wedges being adapted to bear against the inclined surfaces of the gibs and force the same outwardly, valve-gates loosely supported on said gibs, and means for raising and lowering said carrier, substantially as described.

2. In a gate-valve, the combination with a carrier-frame having a wedge integral therewith at its upper portion, gibs loosely supported by said frame having their inner faces inclined, said wedge being adapted to bear against the inclined face of the gibs and force the same outwardly, valve-gates loosely journaled to each of said gibs and carried thereby, lugs cast integral with the valve-casing at the base and inner portion thereof, adapted to arrest the downward movement of the valve-gates, and means for raising and lowering said carrier, substantially as described.

3. In agate-valve, a casing, valve-openings therein, gates fitting the same, a carrier within the casing, gibs loosely engaging the gates on one side and the carrier on the other side, said gibs and carrier having inclined wedging upper surfaces, the gibs also having inclined lower wedging surfaces, a coacting wedge therefor loosely supported by and projecting through the bottom plate of the carrier, a removable plate for closing the bottom of the valve-opening, adapted to arrest said loose wedge in its descent, and means for raising and lowering said carrier, substantially as described.

4:. In agate-valve, a casing, valve-openings therein, gates fitting the same, a carrier within the casing, gibs loosely engaging the gates on one side and the carrier on the other side,- said gibs and carrier having inclined wedging upper surfaces, the gibs also having inclined lower wedging surfaces, a coacting wedge therefor loosely supported by and projecting through the bottom plate of the carrier, lugs formed on the inside lower extremity of the casing for supporting the gates, a removable plate for closing the bottom of the valveopening, adapted to arrest saidloose wedge in its descent, and means for raising and lowering said carrier, substantially as described.

In testimony whereof I have hereunto set my'hand.

OLIVER B. KAISER.

Witnesses:

IDA J. LUCAS, EDNA Wow.

IIO 

